What is the largest prime less then 120

113.

Step-by-step explanation:

119 is divisible by 7.

117 is divisible by 3.

I think it's 113.

If you use your calculator to divide 113 by odd numbers up to 57 you can check if it is prime. You stop at 57 because 57*2 = 114. You need not divide by any number ending in 5 because 113 ends in 3.

I have done this and can't find a quotient that is a whole number so it must be prime (unless I've made a mistake!).